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. 2024 Sep 13;10(37):eadn7763. doi: 10.1126/sciadv.adn7763

Fig. 5. Time-resolved spectroscopic analysis.

Fig. 5.

(A) Femtosecond-transient absorption (fs-TA) spectra of a drop-cast film of 1 on a quartz substrate. (B) Decay profiles of TA of a drop-cast film of 1 at 456 (blue) and 525 nm (red), observed after laser-pulse excitation at 670 nm. (C) Decay-associated spectra (DAS) of 1 obtained from the global fitting analysis. The fitting model used includes two exponential components [exp(0.15 ps) and exp.(3.1 ps)], a distributed decay component [dist(240 ps)], and a response that does not depend on the delay time (Const) due to excitation scattering and other instrumental effects. (D) Calculated TA spectra of the intermediate states of 1. (E) fs-TA spectra of a drop-cast film of 2 on a quartz substrate. (F) DAS of 2 obtained from the global fitting analysis. The fitting model used includes the distributed decay component [dist(2.3 ps)] attributed to the decay of the singlet excited state, and an exponential decay [exp(850 ps)] from excimer to the ground state. The 2D fs-TA spectra of drop-cast films of 1 and 2 on a quartz substrate are shown in fig. S34.